1.Click the 
button corresponding to the volume you want to modify.
2.Type the cache read ahead multiplier (0 to 65535 bytes) in the Cache
A cache read ahead multiplier copies additional data blocks into the cache while it is reading and copying
3.(Optional) Select Read Caching.
When this option is enabled, the host's operations are stored in controller cache memory.
4.(Optional) Select Write Caching.
When this option is selected, data is written to the cache memory of a controller
5.(Optional) Select Write Caching with Mirroring.
Use this option to preserve data if a controller or the cache fails. When this option is enabled, the data is written to two redundant controllers of the same cache size. This configuration provides redundancy in case a controller fails. One controller performs uncompleted write operations when the other controller fails.
NOTE: See ”Changing the Owner of a Volume (Engenio, CLARiiON and Sun 6130)” on page 320 for information about changing the owner assigned to the volume.
Changing the Owner of a Volume (Engenio, CLARiiON and Sun 6130)
When a volume is created, the management server automatically assigns a controller to be the owner of the volume. You can change the owning controller if you want to use a different one for LUN masking.
NOTE: If the owner becomes unreachable as a result of a network failure or the owner itself fails, the other controller in the pair automatically becomes the owner of the volume.
To change the owner:
1.Click the 
button corresponding to the volume you want to modify.
2.Select the owner for the volume from the Current Owner
3.Click OK.
Managing Storage Pools
This section describes the following:
•”Creating a Storage Pool (Engenio, CLARiiON, Sun 6130 and Sun 35xx)” on page 321
•”Accessing Information About Storage Pools” on page 321
•”Deleting a Storage Pool (Engenio and CLARiiON Only)” on page 322
320 Provisioning Manager